android Draw

package com.example.and6;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;public class MainActivity extends  Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main2);final DataTable tab=(DataTable) findViewById(R.id.tab);findViewById(R.id.but).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString[][]data=new String[(int) (Math.random()*5+5)][ (int) (Math.random()*3+1) ];for (int i = 0; i < data.length; i++) for (int j = 0; j < data[i].length; j++) data[i][j]=Math.pow(i+j, 5)+"";data[0][0]="安卓Draw123";tab.setData(data);}});} }

package com.example.and6;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;import android.widget.FrameLayout.LayoutParams;public class DataTable extends View {public DataTable(Context context  ) {super(context);// TODO Auto-generated constructor stubinit();}public DataTable(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinit();}public DataTable(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);// TODO Auto-generated constructor stubinit();}@SuppressLint("NewApi")public DataTable(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);// TODO Auto-generated constructor stubinit();}private Paint paint;private String[][] data;private int textPadding=10;private void init() {// TODO Auto-generated method stubpaint=new Paint();paint.setColor(Color.BLACK);paint.setStyle(Style.FILL);paint.setAntiAlias(true); }public void setData(String[][]data) {this.data=data;Rect rect=new Rect();paint.getTextBounds("A测量", 0, 1, rect);getLayoutParams().height=(rect.height()+ textPadding*2 )*data.length+getPaddingTop()+getPaddingBottom();//设置布局参数后会自动调用onMeasure 和 onDrawsetLayoutParams(getLayoutParams()); }@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { System.out.println("measure  widthMeasureSpec= "+MeasureSpec.getSize(widthMeasureSpec) +" "+MeasureSpec.getMode(widthMeasureSpec));System.out.println("measure  heightMeasureSpec= "+MeasureSpec.getSize(heightMeasureSpec) +" "+MeasureSpec.getMode(heightMeasureSpec));if (data==null) {//一开始宽高设置为0 heightMeasureSpec=MeasureSpec.makeMeasureSpec(  0, MeasureSpec.EXACTLY); widthMeasureSpec=MeasureSpec.makeMeasureSpec(0, MeasureSpec.EXACTLY);}super.onMeasure(widthMeasureSpec, heightMeasureSpec);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);if (data==null) {return;}//表格大小int w=getWidth()-getPaddingLeft()-getPaddingRight();int h=getHeight()-getPaddingTop()-getPaddingBottom();float cellW=w*1.0f/data[0].length;//每一个单元格大小float cellH=h*1.0f/data.length;System.out.println("draw h="+h+ "  cellH="+cellH);canvas.translate(getPaddingLeft(), getPaddingTop());//移动到指定位置for (int i = 0; i <=data.length; i++) {canvas.drawLine(0, i*cellH, w, i*cellH, paint);}for (int i = 0; i <=data[0].length; i++) {canvas.drawLine(i*cellW, 0, i*cellW, h, paint);}for (int i = 0; i < data.length; i++) {for (int j = 0; j < data[i].length; j++) {//计算字体大小Rect rect=new Rect();paint.getTextBounds(data[i][j], 0, data[i][j].length(), rect);float offsetX=(cellW-rect.width())/2;float offsetY= textPadding+rect.height();//绘制字符串时 已字符串左下角为原点，向右为正，向上为正canvas.drawText(data[i][j],j*cellW+offsetX , i*cellH+offsetY, paint);}} }}

package com.example.and6;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;public class MyView extends View {public MyView(Context context  ) {super(context);// TODO Auto-generated constructor stubinit();}public MyView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinit();}public MyView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);// TODO Auto-generated constructor stubinit();}@SuppressLint("NewApi")public MyView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);// TODO Auto-generated constructor stubinit();}private Paint paint;private void init() {// TODO Auto-generated method stubpaint=new Paint();paint.setColor(Color.BLACK);paint.setStyle(Style.STROKE);paint.setAntiAlias(true);}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);paint.setStyle(Style.STROKE);canvas.translate(getWidth()/2, getHeight()/2);canvas.drawCircle(0, 0, getWidth()/2-getPaddingBottom(), paint);paint.setStyle(Style.FILL);int strheight = 0;for (int i = 1; i < 13; i++) {//每次旋转30度，旋转的是画布，坐标没有旋转canvas.rotate(360/12);canvas.drawLine(0, -getWidth()/2+getPaddingBottom(), 0, -getWidth()/2+getPaddingBottom()+10, paint);String txt=i+"";Rect rect = new Rect();//返回包围整个字符串的最小的一个Rect区域paint.getTextBounds(txt, 0, txt.length(), rect);int strwidth = rect.width(); strheight = rect.height();//float w=paint.measureText(txt);canvas.drawText(txt, 0-strwidth/2, -getWidth()/2+strheight+10+getPaddingBottom(), paint);canvas.drawCircle(0, 0, 2, paint);}canvas.drawLine(0, 0, getWidth()/2-getPaddingBottom()-strheight-20, -50, paint);canvas.drawLine(0, 0, -( getWidth()/2-getPaddingBottom()-strheight-40), - getWidth()/6 , paint);}}

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:background="#fff"        android:orientation="vertical" >        <Button            android:id="@+id/but"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/hello_world" />        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="horizontal" >            <Button                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="xxx" />            <com.example.and6.DataTable                android:id="@+id/tab"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="#aaa"                android:padding="10dp" />            <Button                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="mmm" />        </LinearLayout>        <com.example.and6.MyView            android:layout_width="250dp"            android:layout_height="350dp"            android:layout_centerInParent="true"            android:background="#aaa"            android:padding="15dp" />    </LinearLayout></ScrollView>

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